Merge ManaBox exports into one Mana Pool import

Drop in as many ManaBox CSV exports as you have. Cards scanned across separate sessions collapse into one line, quantities summed and prices averaged, ready to import into Mana Pool.

Drop ManaBox CSV exports hereor choose files from your computer

Your files never leave this tab. The merge runs in JavaScript on your own machine, with no upload and no account.

Keep the grade you scannedMana Pool stores every ManaBox condition one grade harsher than it was scanned, so near mint cards get listed as LP. Tick this to send each card one notch up, which cancels that out and lists your near mint cards as NM.

See the full mapping

You scanned	Mana Pool stores	Ticked, it stores
Mint	NM	NM
Near mint	LP	NM
Excellent	MP	LP
Good	MP	MP
Light played	HP	MP
Played	HP	HP
Poor	DMG	DMG

Exporting from ManaBox

Open the collection or binder you scanned.
Tap the menu, then Export.
Choose the ManaBox CSVformat, not Moxfield or plain text.
Repeat for every session you want merged, then drop them all in at once.

What the merge does

Rows count as the same card when their Scryfall ID, finish, condition, and language all match. A foil and a non-foil copy stay on separate lines, as do a near mint and a played copy.
Quantities are summed. Purchase prices are averaged, weighted by quantity, and left exactly as your export recorded them.
Every other column comes through untouched, including any column only some of your files happen to have.

Nothing you drop here is kept

Your CSVs are read by JavaScript running in this tab. They are never uploaded, and no server of mine ever sees a card in your collection.
This page sets no cookies and saves nothing to your browser's storage. There is no account, no database, and no log of what you converted.
Close the tab and every file you dropped is gone. A reload starts from an empty page.
The one request the page makes is an anonymous pageview count through Plausible, which sets no cookies and collects nothing personal. It never sees your file.
You do not have to take my word for any of this. Open your browser's network tab and convert a file, or switch off your Wi-Fi first. The conversion works either way.